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    <title>Document</title>
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<body>
    <!-- 编写函数has(arr , 60) 判断数组中是否存在60这个元素，返回布尔类型 -->
    <script>
        var arr = [1, 2, 3, 60];
        // var arr2 = [1, 2, 3];
        function has(arr, n) {
            var flag = false; //默认数组中不包含60
            for (var i = 0; i < arr.length; i++) {
                // console.log(i);
                console.log(arr[i]);
                if (arr[i] == n) {
                    flag = true;
                    break;
                }
            }
            return flag;
        }
        console.log(has(arr, 60));
    </script>
</body>

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